Download Darwin Day Competition

Darwin Day Competition!
Choose from the following list the letter of the ONE
evolutionary concept that best describes or defines each
situation:
a.
b.
c.
d.
e.
f.
g.
h.
adaptive radiation
i.
allopatric speciation
convergent evolution
k.
directional selection
disruptive/dispersive selection m.
geographical isolation
behavioral isolation
o.
temporal isolation
founder effect
j. genetic drift
mimicry
l. stabilizing selection
sympatric speciation
n. gametic isolation
mechanical isolation
p. hybrid sterility
1. IN the 1700’s a sailor left a breeding pair of dogs on the
Galapagos. The dogs ate middle-sized marine iguanas. Smaller
lizards could hide in rock crevices: larger ones were too big to
handle. Darwin found two size populations of the reptiles when he
visited years later.
2. Today in Nevada there are numerous species of pupfish, each
restricted to a single water hole. These water holes are all that
remain of large lakes formed by glacial melt at the end of the
Pleistocene epoch.
3. In the late 1800’s hunters destroyed most of the large population
of northern elephant seals; only about 20 survived. Since then
the population has increased to over 30,000. No allelelic
variation has occurred in the 24 gene loci analyzed from recent
samples.
4. The frequency of an allele responsible for particular shell
morphology in a certain species of snails inhabiting Blue Island is
0.36. Initially no such snails were found on Green Island, 15
miles to the west, but three years after a severe tropical storm in
the area, a population of snails was discovered there in which the
frequency of this allele was 0.52.
5. Today it takes ten times more penicillin to kill the microorganisms
that cause syphilis and gonorrhea than was required 30 years ago.
6. Careful measurements show that duck eggs of average size are more
likely than smaller or larger eggs to produce viable ducklings.
7. Thirteen species of finches have evolved on the several islands of
the Galapagos Archipelago, almost certainly form a single ancestral
species.
8. The American Bittern is a bird which, due to its markings and its
pose, resemble3s reeds and grasses in its environment.
9. In 1975, two Seattle aviaries each contained 15 blue and 15 green
parakeets. IN 1988 all the parakeets in one aviary were blue; 75%
of the birds were green in the second.
10. In 1982, M. Andersson studied the selective advantage of tail
feathers in black-tailed widowbirds. By gluing on long tail
feathers to the males he dramatically improved their success in
attracting mates.
11. The American toad and Fowler’s toad live in the same ponds, but
these species are morphologically dissimilar and complete mating
and reproduction in different seasons.
12. Some species of Anopheles mosquito live and breed in brackish
water, some in running fresh water and others in stagnant water.
13. Two species of orchids with different floral anatomy
14. Two species of pine shed their pollen at different times
15. Dog breeders maintain the purity of dog breeds by keeping dogs
of different breeds apart when they are fertile.
16.
17.
18.